Need Data for Black Hole Barrel using Hornady A-MAX

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  • Need Data for Black Hole Barrel using Hornady A-MAX

    I recently had to rebuild my Grendel AR. I switched to an 18" 1:9 Black Hole Weaponry mid-length barrel, so all of my data for the 20" 1:8 barrel is out the window.

    I have a shooting competition on the near horizon and will not have the time to develop all of the dope required, so I am hoping for a little help, at least for comparative purposes.

    Ranges will be 200 yards up to 1200 yards, and I will be running a YHM 7.62 suppressor. The only ammo I will be using will be the Hornady 123 A-Max (because that is all I have.)

    Any data will help, but muzzle velocity and any bullet drop/drift data (with associated temp, barometer, etc at time of zero) out to 1200 yards will be the most helpful. I will be working from a 100 yard zero.

    Thanks for your help.

  • #2
    Have you chronographed the Hornady 123gr A-MAX yet? Shoot at least 10 rounds over a chrono to get your average, while also doing an accuracy test at 300yds.

    Run the numbers through your ballistics program, and you'll have your zeroing data. Make sure to input the atmospheric data as taken from a good barometer and or weather station unit.

    If your extreme spread is outside of 20fps, you're going to suck at distance, and if you're within 1000ft of sea level, you will hit transonic well before 1200yds.

    Comment

    • NugginFutz
      Chieftain
      • Aug 2013
      • 2622

      #3
      Well, as always, YMMV. Please take time to check pressures during a load work up from safe starting weight. This statement has not been evaluated by the FDA and is not intended to treat or diagnose any diseases or illnesses.

      Ok - my 22" BHW barrel really likes 28.2 gr IMR 8208 for those 123 gr A-Max pills. I use Hornady brass, CCI450 primers, and seat at 2.260". Groups are consistently 1/4 - 1/2".

      MV @ 10' is 2600, and SD's are in the low teens.

      Dope to follow...

      Data for 5600 ft. Elevation, 62'F, 82% RH

      Range Drop Drop Wind. Wind. Veloc. Energy Time
      (yards) (in). (mrad) (in) (mrad) (fps) (ft-lbs) (sec)
      0 -2.50 0.00 0.00 0.00 2621 1876 0.00
      100 -0.00 -0.00 -0.00 -0.00 2441 1627 0.12
      200 -3.35 -0.46 1.04 0.14 2269 1405 0.25
      300 -13.46 -1.25 3.22 0.30 2103 1208 0.38
      400 -31.44 -2.18 6.69 0.46 1945 1033 0.53
      500 -58.63 -3.26 11.61 0.64 1793 878 0.69
      600 -96.67 -4.47 18.18 0.84 1647 740 0.87
      700 -147.56 -5.86 26.66 1.06 1505 619 1.06
      800 -213.85 -7.42 37.36 1.30 1370 512 1.27
      900 -298.73 -9.22 50.64 1.56 1241 421 1.50
      1000 -406.28 -11.28 66.92 1.86 1123 344 1.75
      1002 -409.91 -11.35 67.46 1.87 1120 342 1.76
      1100 -541.33 -13.67 86.16 2.18 1051 301 2.03
      1200 -707.82 -16.38 107.39 2.49 1009 278 2.32
      Range Drop Drop Wind. Wind. Veloc. Energy Time
      Last edited by NugginFutz; 01-22-2014, 04:41 AM.
      If it's true that we are here to help others, then what exactly are the others here for?

      Comment


      • #4
        Thanks for the data NugginFutz and LRRPF52. I probably should have been a little more specific. In the very short period of time between now and the competition, I do not have access to a chronograph or a range outside of 100 yards. It is because of this that I need the data, if available. I will be shooting factory Hornady ammunition, not hand loads, because that is all I have.

        There are a multitude of things that I cannot fix or prevent: Air density (450 ASL), bullet limitations (I cannot get any different ammunition), or the sadistic nature of the competition operators (800 yard movers, 12" plate at 1200 yards painted with a color similar to the surrounding area) among others. Pile on top of that the limitations of the platform and the trigger puller, and I will be lucky to hit much beyond 700 yards - buy hey, it will be fun to try.

        Comment

        • terrywick4
          Warrior
          • Sep 2014
          • 181

          #5
          I got my labradar and took it for a test spin. was windy so didn't spend much time but did shoot a string thru tht 18" BHW

          123.JPG

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